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Not sure which of these is best. What do you think?

Harness viruses

STATUS: Human clinical trials

Bacteria have natural predators called phages—viruses that replicate inside the organisms and burst out to destroy them, Alien-style. One upcoming trial pits phages against bugs in infected burn wounds, while another targets drug-resistant staph.

Bacteria already attack competing bugs with toxins called bacteriocins; doctors just need to get them to target the right ones. Researchers engineered a strain to deploy these chemicals only when they detect pheromones from a pathogenic bug.

Edit out bad bacteria

STATUS: Proof of concept

A recently discovered gene-editing system called Crispr attacks bacteria by destroying their DNA. It searches out gene sequences unique to drug-resistant strains and then chops up the strands to annihilate the organisms.